lighthouse, n. light tower, Pharos, lightship, beacon boat, sailor's landmark; watchtower, lookout, observation post; beacon, signal, warning light, guiding light, guide, Naut. beaconage.
lighting, n. setting fire to, setting a match to, igniting, kindling; illuminating, brightening; illumination, radiation, irradiation.
lightless, adj. dark, pitch-dark, dark as night, nightly, nightlike, unlighted, unlit, unilluminated, aphotic, tenebrous, obscure, Literary, darkling; black, black as ink, inky, pitchy, jetblack, nigrescent; ill-lighted, poorly lit, dim, dull, faint, dusky, gloomy, Stygian, shady, shadowy, penumbral, penumbrous, Archaic. caliginous.
lightly, adv. 1. slightly, a little bit, (in prescriptions) leviter; gently, kissingly, softly; gingerly, carefully, timidly.
2. cheerfully, gaily, sunnily, brightly, blithely, optimistically, positively; buoyantly, breezily, carefreely, debonairly; merrily, mirthfully, laughingly, smilingly; happily, gladly, joyfully, jubilantly, gleefully.
3. easily, airily, buoyantly, flittingly, spryly, quickly; nimbly, agilely, supplely.
4. frivolously, flippantly, saucily, impertinently; thoughtlessly, carelessly, heedlessly; indifferently, uncaringly, slightingly, Inf. with a grain of salt.
light-minded, adj. fanciful, frivolous, flyaway, un-serious, unsolemn, given to levity; trivial, trifling, light-headed, petty, small-minded; thoughtless, shallow, empty-headed, vacuous, superficial; featherheaded, featherbrained, harebrained, birdbrained, scatterbrained, rattlebrained.
lightness', n. 1. brightness, illumination, luminescence, luminosity, radiation; luminousness, brilliance, radiance, lambency, luster, shine, effulgence, irradiation, glow, florescence, incandescence, phosphorescence; blare, glare.
2. paleness, whitishness, colorlessness; dimness, indistinctness, obscureness, faintness.
lightness2, n. 1. weightlessness, unheaviness, levita-tiveness; floatiness, ethereality, etherealness, featheriness, delicateness, delicacy; slightness, thinness, slenderness, skinniness.
2. airiness, bouyancy, flittingness, wingedness, spryness, quickness, lightsomeness, light-footedness; deftness, dexterousness; agility, nimbleness, suppleness, sprightliness, Dial, gainliness, litheness, grace, gracefulness.
3. cheerfulness, cheeriness, gaiety, sunniness, brightness; blitheness, blithesomeness, optimism, positiveness, beamishness; easygoingness, breeziness, insouciance, carefreeness; joviality, merriness, jocundity, jollity, mirth, mirthfulness; happiness, gladness, joy, joyfulness, glee, gleefulness, elation.
4. levity, frivolity, foolishness, folly, irresponsibility; impulsiveness, fickleness, changeability, inconstancy; flightiness, giddiness, capriciousness.
lightning, n. 1. thunderbolt, bolt, thunderbolt of Jove, flash or stroke or heat lightning, sheet lightning, chain lightning, fork or forked lightning, fireball; northern lights, polar lights, aurora borealis, aurora polaris. -adj. 2. fulgurant, flashing, cracking, rippling, streaking; swift, speedy, split-second; instantaneous, precipitate; electrifying, dazzling.
lightsome1, adj. 1. airy, immaterial, incorporeal, bodiless, light, weightless, vaporous, vapory; visionary, phantasmal, chimeral, ethereal, otherworldly, dreamlike; feathery, fluffy, gossamery, gossamer, light as a feather; Ariel-like; buoyant, resilient, floating, bouncy, bubbly.